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If you put this in /etc/dhcpd.conf and then type: service dhcpd restart
Dchp will give only ip-addresses to the known clients. You can even give
them fixed addresses. If you want to do that then the host line should
be: host trusted1 { hardware ethernet *:*:*:*:*:*; fixed-address
192.168.1.75}
And the hardware ethernet is the MAC address.

---------------Original Message---------------
>Hi There,
>
>Is there anyway one can make sure DHCP only give out ip
addresses only
>to computers in the domain?

If your router has settings in the setup menu called a MAC (media
access controller) filter, you may choose to assign only the
computers you want even if they have the network key. I have a
D-Link DGL-4300 Gaming Router+Wireless, and this is how I filter
people who have the code to my network that I don't want on
anymore while not having to change the code in all previous
clients.

if you mean that the computers are wired to an specific router than MAC
address is an way to do it but if you are on the wireless than you can add
encryption to avoid other computers to connect maybe a bit uneccesary
comment but still in case you are using wireless ...